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PostgreSQL High Availability Cookbook - Second Edition

You're reading from PostgreSQL High Availability Cookbook - Second Edition

Product type Book

Published in Feb 2017

Publisher Packt

ISBN-13 9781787125537

Pages 536 pages

Edition 2nd Edition

Languages

Concepts

High Performance Programming

Author (1):

Shaun Thomas

Table of Contents (18) Chapters

Title Page

Credits

About the Author

About the Reviewer

www.Packtpub.com

Customer Feedback

Preface

1. Hardware Planning

2. Handling and Avoiding Downtime

3. Pooling Resources

4. Troubleshooting

5. Monitoring

6. Replication

7. Replication Management Tools

8. Simple Stack

9. Advanced Stack

10. Cluster Control

11. Data Distribution

Upgrading while staying online

We've all encountered this scenario. PostgreSQL recently released version 9.6.1 and we need to upgrade to protect ourselves from potential data corruption. Or perhaps it isn't PostgreSQL that requires an upgrade, but the system kernel or another critical element of the operating system.

Regardless of the reason, we must accommodate the procedure somehow. Upgrading software while remaining online is the ultimate aspiration of maintaining a high availability stack. Let's see how we can reach that goal by leveraging Patroni's functionality.

Getting ready

This recipe depends on the presence of the entire stack. Please complete all recipes up to Installing and configuring HAProxy before continuing.

How to do it...

For this recipe, we should still have three PostgreSQL servers. As usual, we'll assume they are named pg1, pg2, and pg3. If pg1 is the initial leader, follow these steps to perform an in-place system upgrade:

Start a status monitor on pg3 with the following...

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Authors (1)

Shaun Thomas

Shaun M. Thomas has been working with PostgreSQL since late 2000. He is a frequent contributor to the PostgreSQL Performance and General mailing lists, assisting other DBAs with the knowledge he's gained over the years. In 2011 and 2012, he gave presentations at the Postgres Open conference on topics such as handling extreme throughput, high availability, server redundancy, and failover techniques. Most recently, he has contributed the Shard Manager extension and the walctl WAL management suite. Currently, he serves as the database architect at PEAK6 Investments, where he develops standard operating procedure (SOP) guidelines to facilitate reliable server architecture among many other tasks. Many of the techniques used in this book were developed specifically for this extreme environment. He believes that PostgreSQL has a stupendous future ahead, and he can't wait to see the advancements subsequent versions will bring. https://www.linkedin.com/in/bonesmoses

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